Automatic guard for grinding wheels



Mar. 13, 1923. 1,44%996.

M. w. MUEHLHAUSER;

AUTOMATIC GUARD FOR GRINDING WHEELS.

FILED JAN. 20, 1922.

Patented Mar. 13, 1923.

MARTIN 'WM. MUEHLEAUSEBI. OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TOSHERMIAN W. SCOFIELD, OF CLEVELAND, OHIO.

AUTOMATIC GUARD FOR GRINDING WHEELS.

Application filed January 20, 1822. Serial No. 530,696.

To all to 710m it may concern Be it known that I, MARTIN W. MUEHL-HAUSER, a citizen of the United States, resident of Cleveland, county ofCuyahoga, and State of Ohio, have invented new and useful Improvementsin Automatic Guards for Grinding Wheels, of which the following is aspecification, the principle of the invention being herein explained andthe bestmode in which I have contemplated applying that principle, so asto distinguish it from other inventions.

My invention relates to guards for grinding wheels and particularly toapparatus of this nature adapted for use upon emery wheel grinders. Myinvention further relates to a combination guard for protecting the eyesand face of the operator during the use of the wheel andfor protectingthe operator automatically from injury in the event that the wheelbreaks.-

The annexed drawing and the following description set forth in detailcertain means embodying my invention, the disclosed means, however,constituting but one of the various mechanical forms in which theprinciple of the invention may be employed.

In said annexed drawing:

Figure 1 represents a side elevation of an emery grinding wheel, towhich my improved guard is attached, the cover plate of the wheelhousing being broken away;

Figure 2 represents a. broken plan view of the elements shown in Figure1; and

Figure 3 represents an elevation of the elements shown in Figure 1,taken from the plane indicated by the line IIIIII, Figure 1.

Referring to the annexed drawing, in which the several. elements areindicated by the same ordinals in the respective views, I indicate, bythe ordinal 1 the sheet metal frame of an eye guard for abrading 'orcutting tools, such as is particularly shown, described and claimed inU. S. Letters Patent, No. 1,259,050, said frame encompassing areinforced glass body 2 in the form of eye guard shown in said Patent,No. 1,259,050. An opening exposing a portion of the emery wheel 3 isindicated by the ordinal 4 and through this opening the work isintroduced to the wheel for the grinding operation, as is wellunderstood by those skilled in the art. The eye guard 1 is normally heldto cover the opening 4 so as to prevent the chips or particles of metalor a-brading wheels from causing injury to the eyes and face of theoperator. v

In the improvements herein shown, described and claimed, I havepro'videda support for the eye guard 1 which automatically, upon thebreaking of the wheel 3., will be actuated to cover the opening-4 toprotect the operator from the flying wheel fragments which would beprojected through said opening. I indicate the wheel housing by theordinal 5, the same having the face plate 6. Slidably mounted upon thelateral wall 7 of this housing 5 is the support for the eye guard 1,.hereinbefore mentioned, to which said eye guard is hingedly connected.This support consists of a bifurcated spring member having the base 10and the two leaves or branches 11 and 12 disposed respectivelyexteriorly and interiorly of the wall 7. This bifurcated spring memberis mounted substantially on topof the wall 7, as plainly shown in Figure1, and is held to a position in which the eye guard 1 normally coversthe opening. a by means of a hooked extension 13 formed upon theexterior spring leaf 11 which engages a transverse slot 8 formed in theexterior surface of the wall 7, The interior surface of the wall 7 is,formed with a hole 9 intersecting the slot '8 and adapted loosely toaccommodate a pin 15 extending interiorly of the wall 7 and utilized fora purpose hereinafter explained. The interior branch 12 of thebifurcated movable spring member has formed upon its inner surface anumber of projections or lugs 1 1 suitably disposed and spaced for thepurpose hereinafter described, one of the suitable an rangements beingplainly shown in Figure 1. The pin 15 is held to the hole 9 by means ofthe leaf member 12 of the movable spring guard, one of the lugs 14 beingformed adjacent the pin 15, as plainly shown in Figure 1. A light crownspring washer 17 holds the member 12 in the position shown.

From the above description and the accompanying drawing, it will beevident that, if the wheel 3 breaks in operation, the centrifugallymoving wheel fragments will strike the lugs 14 of the memben 12, movingsaid member outwardly against the pressure of the light spring 17 towardthe inner surface of the wall 7, thus causing the pin 9 to knock theextension 13 from the slot 8,

allowing the Wheel fragments to exert further force upon the lugs 14: tomove the spring member over the Wall 7 into a position Where the base 10rests upon the tool rest 16, whereby the opening 4: is covered by thespring member, thus preventing the Wheel fragments from being thrownthrough the opening 4, the tool rest 16 forming a stop for the coveringmovement of the spring member, and the hinged connection of the eyeguard 1 and said spring member allowing the eye guard 1 to assume theposition shown in dotted lines in Figure 1. This covering action of thespring guard is so concomitant With the centrifugal movement of theWheel fragments that the latter are ef- -ltectively prevented fromescaping through the opening 4.

What I claim is 2- 1. A guard for grinding Wheels comprising, incombination with a Wheel housing having a Wall opening to expose theWork, a spring plate slidably mounted upon said housing and formed Withan angular extension adapted to grip or to be hooked into the housing tohold the plate out of the area of vision of the Work; and means adapted,upon the breaking of wheel, automatically to break the hold of saidangular extension and to move said plate to cover said opening.

2. A guard for grinding Wheels comprising, in combination With a Wheelhousing having a Wall opening to expose the Work, a bifurcated springmember slidably mounted upon both sides of a Wall of the housing; meansholding said member out of the area of vision of the Work; and meansadapted, uplon the breaking of the Wheel, automatica 1y to move saidmember to cover said opening.

3. A guard for grinding Wheels comprisspring member adjacent saidangular extension and adapted, upon the breaking of the Wheel, to beactuated to move said extension to break the hold of the same upon thehousing; and means automatically moving the member to cover saidopening, when said pin is so actuated.

4:. A combination guard for grinding Wheels comprising, With a Wheelhousing having a Wall opening to expose the Work,

a transparent eye guard normally covering said opening; a metallicsupport for said guard movably mounted upon said housing; and meansadapted, upon the breaking of the Wheel, automatically to move saidsupport to cover said opening.

5. A combination guard for grinding Wheels comprising, with a Wheelhousing having a Wall opening to expose the Work, and a tool restadjacent the lower portion of said opening; of a transparent eye guardnormally covering said opening; a metallic support hingedly connected tosaid guard and movably mounted upon said housing; and means: adapted,upon the breaking of the Wheel, automatically to move said sup port tocover said opening, said tool rest forming a stop for the coveringmovement of said support.

Signed by me this 9th day of January, 1.922.

MARTIN M. li IUEHLHAUSER.

